A compact dual-band Wi-Fi 7 antenna integrated into the rear camera module of a mobile terminal

Abstract

The application discloses a compact dual-band Wi-Fi 7 antenna integrated in a rear camera module of a mobile terminal, the antenna is arranged in a fragmentation space of the camera module, is a vertically stacked multi-layer integrated structure, a profile height is less than or equal to 2 mm, and a high-frequency antenna unit and a low-frequency antenna unit that are physically isolated and independently fed are arranged; the high-frequency antenna unit is arranged at an edge of the module, a folding structure is matched with four parasitic strips to excite multiple resonances, and the low-frequency antenna unit is arranged in a gap between double cameras; a symmetric fine groove is formed on a radiation patch of the low-frequency antenna unit, a metalized short-circuit via is matched to control magnetic coupling, and both the units are fed by near-field coupling. The antenna realizes dual-band coverage of 2.37-2.55 GHz and 5.15-7.15 GHz, is adapted to Wi-Fi 7 full bands, can be directly embedded into the module and does not need to change the original structure of the terminal, and is realized by relying on a PCB process, and has strong engineering practicability.

Description

Technical Field

[0001] This invention relates to the field of microwave communication and mobile terminal antennas, specifically to a compact dual-band Wi-Fi 7 antenna integrated into the rear camera module of a mobile terminal. Background Technology

[0002] With the widespread adoption of 5G communication technology and the rapid evolution of next-generation wireless technologies such as Wi-Fi 7, mobile terminals such as smartphones and tablets are rapidly developing towards multi-functional integration, ultra-miniaturization, and full-band coverage. Currently, mobile terminals need to simultaneously support the 2.4GHz (2.4GHz~2.484 GHz), 5GHz (5.15GHz~5.83 GHz), and 6GHz (5.925GHz~7.125GHz) frequency bands covered by the Wi-Fi 7 protocol standard, as well as 3G, 4G, and 5G mobile communication frequency bands. However, the space available for antenna placement inside the device is continuously being compressed due to the increase in screen ratio and the integration of functional modules (such as multiple cameras and wireless charging), forming the core contradiction between the demand for multi-band antennas and the shortage of space resources.

[0003] Currently, the mainstream solutions for built-in antennas in mobile terminals are two types: frame integration and back panel integration. Frame-integrated antennas suffer from extremely limited space due to the already occupied MIMO antennas for 3G, 4G, and 5G mobile communication bands within the phone's frame area, making it difficult to support the multi-band and wideband requirements of Wi-Fi 7. Back panel-integrated antennas, limited by ultra-low clearance, generally face issues such as narrow operating bandwidth and poor antenna radiation performance, thus also failing to support the broadband application requirements of Wi-Fi 7. The camera area, a common functional area in mobile terminals, has been consistently underutilized as an antenna placement area. However, there is a large amount of underutilized compact space around and inside the camera module, such as lens gaps and module edge areas, which could potentially be utilized for antenna placement. Furthermore, camera modules often protrude from the phone's back panel, providing good clearance and offering a possibility for wideband antenna design. Summary of the Invention

[0004] Purpose of the invention: In view of the above-mentioned prior art, a compact dual-band Wi-Fi 7 antenna integrated into the rear camera module of a mobile terminal is proposed.

[0005] Technical solution: A compact dual-band Wi-Fi 7 antenna integrated into the rear camera module of a mobile terminal. The antenna is integrated into the idle fragmented space of the rear camera module of the mobile terminal. The space is at least one of the following: the gap between multiple lenses, the redundant area at the edge of the module, and the gap between the lens and the main frame of the mobile terminal.

[0006] The antenna adopts a vertically stacked multi-layer integrated structure, consisting of a top-layer metal radiating layer, a first substrate, a middle metal structural layer, a second substrate, and a metal ground layer, with an overall cross-sectional height not exceeding 2mm. The antenna includes physically isolated high-frequency antenna units and low-frequency antenna units, and is equipped with a dual-port independent feeding system. Combined with a non-contact near-field coupling feeding structure and a magnetic coupling control structure, it achieves dual-band broadband coverage of 2.37GHz~2.55GHz and 5.15GHz~7.15GHz, fully covering the entire operating frequency band of the Wi-Fi 7 standard: 2.4GHz, 5GHz, and 6GHz.

[0007] Furthermore, the high-frequency antenna unit includes several independent narrowband parasitic strips disposed on the top layer as the radiation structure of the high-frequency antenna unit; wherein several parasitic strips are folded and extended along the side of the first substrate to the surface of the second substrate to form a folded radiation structure; the high-frequency antenna unit adopts a non-contact near-field coupling feeding structure, which is independently fed by a high-frequency coaxial port to excite the radiation structure to generate multiple resonant modes, forming an ultra-wideband of 5.15GHz~7.15GHz.

[0008] Furthermore, the low-frequency antenna unit adopts a non-contact near-field coupling feeding structure, which is independently fed by the low-frequency coaxial port; the top metal radiating patch of the low-frequency antenna unit has several strip-shaped slots to extend the current path and tune the operating frequency band; the magnetic coupling control structure is a metallized short-circuit via that vertically penetrates the substrate to match the low-frequency antenna unit. By adjusting the position, diameter, and number of vias, the magnetic coupling strength of the non-contact near-field coupling feeding is controlled, thereby exciting a dual-resonance mode to achieve broadband coverage of 2.37GHz~2.55GHz.

[0009] Furthermore, the high-frequency antenna unit is disposed in the edge area of ​​the camera module, and the low-frequency antenna unit is disposed in the gap area closely surrounding the two cameras.

[0010] Furthermore, the high-frequency antenna unit includes four independent narrowband parasitic stripes, which are used to excite four independent resonant modes at 5.3 GHz, 5.8 GHz, 6.3 GHz, and 6.7 GHz, respectively.

[0011] Furthermore, the intermediate metal structure layer includes a rectangular metal strip, which is connected to the probe inner conductor of the high-frequency coaxial port.

[0012] Furthermore, the top metal radiating patch of the low-frequency antenna unit is I-shaped, and four strip-shaped slots are formed in the area between the two cameras. The four strip-shaped slots are symmetrically distributed left and right and up and down.

[0013] Furthermore, the L-shaped metal strip on the upper surface of the second substrate and the top metal radiating patch of the low-frequency antenna unit form a non-contact near-field coupling feeding structure. One side of the L-shaped metal strip is aligned with the central symmetry line of the I-shaped metal patch, and the other side is located at the edge of the I-shaped metal patch.

[0014] Furthermore, two metallized short-circuit vias are located in the area between the two cameras and are symmetrically positioned on both sides of the central symmetry line of the I-shaped metal patch.

[0015] Beneficial Effects: Addressing the extreme scarcity of available space for antenna placement in the bezel area of ​​existing mobile terminal devices and the limitations imposed by ultra-low clearance conditions on backplane antenna integration, this invention utilizes the fragmented space of the rear camera module of a mobile terminal to integrate a Wi-Fi 7 antenna. A high-frequency antenna unit is placed in the edge area of ​​the module next to the camera, employing a folding method to achieve miniaturization of the radiating portion. In the fragmented area tightly surrounding the two cameras, a low-frequency antenna unit adapted to the shape of the fragmented area is placed. Slots are cut into the patch to extend the current path, achieving miniaturization while tuning the operating frequency band. By setting metallized through-holes, the magnetic coupling strength is precisely controlled, allowing the upper and lower parts of the metal patch to couple, further expanding the bandwidth. This invention combines miniaturization, low profile, and high integration of the antenna design, allowing it to be directly embedded into existing camera modules without altering the original terminal structure. It adapts to the ultra-miniaturization and high integration requirements of mobile terminals, ultimately creating a compact dual-band antenna that meets the application needs of Wi-Fi 7 multi-band and wide-bandwidth applications and is highly compatible with the overall structure of mobile terminals, filling a gap in existing technology in this field. Attached Figure Description

[0016] Figure 1 This is a 3D structural schematic diagram of the antenna of the present invention;

[0017] Figure 2 This is a top view of the antenna structure of the present invention;

[0018] Figure 3 This is a side view of the antenna structure of the present invention;

[0019] Figure 4 The simulation results of the reflection coefficient of the antenna element of this invention;

[0020] Figure 5 The simulation results show the radiation efficiency of the antenna element of this invention.

[0021] Figure 6 This is a two-dimensional simulation radiation pattern of the antenna element of the present invention. Detailed Implementation

[0022] The invention will now be further explained with reference to the accompanying drawings.

[0023] like Figures 1 to 3 As shown, a compact dual-band Wi-Fi 7 antenna integrated into the rear camera module of a mobile terminal adopts a vertically stacked multi-layer integrated structure, including a top metal layer, a first substrate 3, a middle metal layer, a second substrate 9, a metal ground 14, and a feeding structure arranged sequentially from top to bottom. The antenna is divided into a high-frequency antenna unit 1 and a low-frequency antenna unit 2.

[0024] The first substrate 3 and the second substrate 9 have two through holes 8 for the two rear cameras of the mobile terminal to penetrate vertically. The top metal layer includes four independent differentiated narrowband parasitic strips 4 that serve as radiators of the high-frequency antenna unit 1, and a top low-frequency metal patch 6. The top low-frequency metal patch 6 serves as the radiating structure of the low-frequency antenna unit 2. The middle metal layer is composed of rectangular metal strips 11 and L-shaped metal strips 13.

[0025] A high-frequency antenna unit 1 is arranged at the edge of the camera module. Two narrow-band parasitic strips 4 extend and fold along the side of the first substrate 3, forming a folded connecting patch 5 on the side of the first substrate 3 and a metal extension patch 15 disposed on the upper surface of the second substrate 9, constituting a folded miniaturized radiating structure. This folded radiating structure can compress the lateral size of the antenna. The rectangular metal strip 11 in the middle layer serves as the near-field coupling feed strip for the metal extension patch 15. The four differentiated narrow-band parasitic strips at the top layer are used to excite multiple resonances, achieving ultra-wideband coverage of 5.15 GHz to 7.15 GHz.

[0026] Two through-holes 8 are symmetrically arranged on the left and right sides. The low-frequency antenna unit 2 is arranged in the gap between the two cameras and in the area closely surrounding the cameras, physically isolated from and independently deployed with the high-frequency antenna unit 1. The top low-frequency metal patch 6 is an I-shaped metal patch structure, and four strip-shaped slots 16 are formed in the area between the two through-holes 8. The four strip-shaped slots are symmetrical on the left and right and top and bottom, and are used to extend the current path and tune the operating frequency band. The L-shaped metal strip 13 on the upper surface of the second substrate 9 forms a non-contact near-field coupling feeding structure with the top low-frequency metal patch 6. In addition, the low-frequency antenna unit 2 is also provided with two metallized short-circuit vias 7 that vertically penetrate the substrate as a magnetic coupling control structure to control the magnetic coupling strength, thereby expanding the bandwidth. The low-frequency antenna unit 2 precisely controls the magnetic coupling strength through the strip-shaped slots of the top low-frequency metal patch 6 and the metallized short-circuit vias 7 to achieve broadband coverage of 2.37GHz~2.55GHz.

[0027] One side of the L-shaped metal strip 13 in the middle layer is aligned with the central symmetry line of the I-shaped metal patch structure, and the other side is located at the bottom edge of the I-shaped metal patch structure. Metallized short-circuit vias 7 penetrate the first substrate 3 and the second substrate 9, connecting the top-layer low-frequency antenna unit metal patch 6 to the metal ground 14. Two metallized short-circuit vias 7 are located between two through-holes 8 and are symmetrically positioned on both sides of one side of the L-shaped metal strip 13.

[0028] In the above structure, the first substrate 3, the second substrate 9, and the metal ground 14 are tightly stacked together from top to bottom, with an overall cross-sectional height ≤ 2mm. The high-frequency antenna unit 1 and the low-frequency antenna unit 2 adopt a dual-port independent feeding system, with a high-frequency coaxial port 10 and a low-frequency coaxial port 12 respectively. The inner conductor of the probe of the high-frequency coaxial port 10 passes through the through hole on the metal ground 14 and the second substrate 9 and is then connected to the rectangular metal strip 11. The inner conductor of the probe of the low-frequency coaxial port 12 passes through the through hole on the metal ground 14 and the second substrate 9 and is then connected to the L-shaped metal strip 13.

[0029] The core working principle of this antenna is based on the synergistic effect of near-field coupled feeding (PCF) and magnetic coupling technology. The non-contact PCF feeding method effectively avoids the impedance mismatch and radiation interference problems that are easily caused by direct feeding. The low-frequency antenna element integrates the current paths of active and parasitic patches through metallized short-circuit vias and precisely controls the magnetic coupling strength to achieve low-frequency broadband coverage of 2.37GHz to 2.55GHz. The high-frequency antenna element excites four independent resonant modes at 5.3GHz, 5.8GHz, 6.3GHz, and 6.7GHz respectively through four independent narrowband parasitic strips at the top layer. The continuous connection of multiple resonant modes forms an ultra-wideband coverage of 5.15GHz to 7.15GHz. At the same time, a folded radiating structure is adopted to significantly reduce the lateral occupied area while ensuring the continuity of electric field and surface current, achieving a synergistic balance between antenna miniaturization and wideband performance. Ultimately, this invention successfully achieved full frequency band coverage within the Wi-Fi 7 protocol standard, including 2.4 GHz (2.4 GHz~2.484 GHz), 5 GHz (5.15 GHz~5.83 GHz), and 6 GHz (5.925 GHz~7.125 GHz).

[0030] In this embodiment, the dielectric substrate is FR-4 with a dielectric constant of 4.4 and a loss tangent of 0.02; the overall antenna profile height is 2mm (0.016λ0~λ0@2.4GHz); the unit planar dimensions are (18mm×10mm)+(26mm×20mm)(0.36λ0×0.2λ0~λ0@6GHz)+(0.21λ0×0.16λ0~λ0@2.4GHz). Through HFSS simulation, the antenna unit's reflection coefficient and radiation efficiency are as follows: Figure 4 and Figure 5As shown, with |S 11 With a standard of ≤ -6 dB, the impedance bandwidth ranges from 2.37 GHz to 2.55 GHz and from 5.15 GHz to 7.15 GHz, achieving full frequency band coverage within the Wi-Fi 7 protocol. Figure 6 The two-dimensional simulation radiation patterns of this antenna element are shown at 2.4 GHz, 5.8 GHz, and 6.7 GHz.

[0031] This invention provides a dual-band Wi-Fi 7 antenna integration solution for use in the fragmented spaces (lens gaps, module edges) of a mobile terminal's rear camera module. By employing a folded radiating structure and utilizing near-field coupled feeding (PCF) and magnetic coupling technologies, it achieves synergistic optimization of antenna miniaturization and broadband performance. A physically isolated, independently fed high- and low-frequency dual-unit structure is designed. The low-frequency antenna unit uses short-circuit vias to control magnetic coupling and excite dual-resonance modes, achieving coverage of the 2.37GHz~2.55GHz band. The high-frequency antenna unit employs a folded structure combined with a parasitic stripe multi-resonance design, achieving ultra-wideband coverage of 5.15GHz~7.15GHz, fully adapting to the entire Wi-Fi 7 operating frequency band. Furthermore, under the space constraints of low profile and small size, a vertically stacked multi-layer structure is adopted, allowing direct embedding into existing mobile terminal camera modules without modifying the original terminal structure. Relying on mature PCB manufacturing processes, it boasts strong engineering practicality.

[0032] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A compact dual-band Wi-Fi 7 antenna integrated into the rear camera module of a mobile terminal, characterized in that, The antenna is integrated into the unused fragmented space of the rear camera module of the mobile terminal. This space is at least one of the following: the gap between multiple lenses, the redundant area at the edge of the module, and the gap between the lens and the main frame of the mobile terminal. The antenna adopts a vertically stacked multi-layer integrated structure, consisting of a top-layer metal radiating layer, a first substrate, a middle metal structural layer, a second substrate, and a metal ground layer, with an overall cross-sectional height not exceeding 2mm. The antenna includes physically isolated high-frequency antenna units and low-frequency antenna units, and is equipped with a dual-port independent feeding system. Combined with a non-contact near-field coupling feeding structure and a magnetic coupling control structure, it achieves dual-band broadband coverage of 2.37GHz~2.55GHz and 5.15GHz~7.15GHz, fully covering the entire operating frequency band of the Wi-Fi 7 standard: 2.4GHz, 5GHz, and 6GHz.

2. The compact dual-band Wi-Fi 7 antenna according to claim 1, characterized in that, The high-frequency antenna unit includes several independent narrowband parasitic strips disposed on the top layer as the radiation structure of the high-frequency antenna unit; wherein several parasitic strips are folded and extended along the side of the first substrate to the surface of the second substrate to form a folded radiation structure; the high-frequency antenna unit adopts a non-contact near-field coupling feeding structure, which is independently fed by a high-frequency coaxial port to excite the radiation structure to generate multiple resonant modes, forming an ultra-wideband of 5.15GHz~7.15GHz.

3. The compact dual-band Wi-Fi 7 antenna according to claim 1, characterized in that, The low-frequency antenna unit adopts a non-contact near-field coupling feeding structure and is independently fed by a low-frequency coaxial port; the top metal radiating patch of the low-frequency antenna unit has several strip-shaped slots to extend the current path and tune the operating frequency band. The magnetic coupling control structure is a metallized short-circuit via that vertically penetrates the substrate to match the low-frequency antenna unit. By adjusting the position, diameter, and number of vias, the magnetic coupling strength of the non-contact near-field coupling feed is controlled, thereby exciting the dual resonant mode to achieve broadband coverage of 2.37GHz to 2.55GHz.

4. The compact dual-band Wi-Fi 7 antenna according to claim 2 or 3, characterized in that, The high-frequency antenna unit is located at the edge of the camera module, and the low-frequency antenna unit is located in the gap area closely surrounding the two cameras.

5. The compact dual-band Wi-Fi 7 antenna according to claim 4, characterized in that, The high-frequency antenna unit includes four independent narrowband parasitic stripes, which are used to excite four independent resonant modes at 5.3 GHz, 5.8 GHz, 6.3 GHz, and 6.7 GHz, respectively.

6. The compact dual-band Wi-Fi 7 antenna according to claim 5, characterized in that, The intermediate metal structure layer includes a rectangular metal strip, which is connected to the probe inner conductor of the high-frequency coaxial port.

7. The compact dual-band Wi-Fi 7 antenna according to claim 4, characterized in that, The top metal radiating patch of the low-frequency antenna unit is I-shaped, and four strip-shaped slots are opened in the area between the two cameras. The four strip-shaped slots are symmetrically distributed left and right and up and down.

8. The compact dual-band Wi-Fi 7 antenna according to claim 7, characterized in that, The L-shaped metal strip on the upper surface of the second substrate and the top metal radiating patch of the low-frequency antenna unit form a non-contact near-field coupling feeding structure. One side of the L-shaped metal strip is aligned with the central symmetry line of the I-shaped metal patch, and the other side is located at the edge of the I-shaped metal patch.

9. The compact dual-band Wi-Fi 7 antenna according to claim 8, characterized in that, Two metallized short-circuit vias are located in the area between the two cameras and are symmetrically positioned on both sides of the central symmetry line of the I-shaped metal patch.

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